Modified Control Channel Element Structures for Narrow Band PDCCH Detection
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Solution Overview
Problem
Existing wireless communication technologies face challenges in maintaining performance when bandwidth is reduced, particularly in narrow band use cases such as 5G deployments in limited spectrum scenarios.
Innovation Solution
The proposed solution involves an apparatus with a processor and memory configured to modify control channel element structures within an initial control resource set. This apparatus determines modified control channel element structures for various aggregation levels, monitors physical downlink control channels, and receives physical downlink shared channels based on these modified structures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional control channel element structures are used in narrow band scenarios, then the PDCCH structure remains standardized and simple to implement, but the detection performance and access reliability deteriorate due to insufficient bandwidth
Solution Approach 1:
The control resource set is divided into multiple control channel elements with different aggregation levels (AL1, AL2, AL4, AL8). Each CCE structure is independently configured with specific resource element patterns and mapping relationships, allowing selective optimization for narrow band scenarios without redesigning the entire PDCCH structure.
Solution Approach 2:
Different control channel element structures are designed with localized optimizations for specific aggregation levels. The first through fourth CCE structures have distinct resource element patterns and mapping characteristics tailored to their respective aggregation levels, enabling targeted performance improvement in bandwidth-constrained environments.
2Reliability
If the PDCCH bandwidth is increased to improve detection performance, then the access reliability improves, but the bandwidth consumption increases which is unacceptable in narrow band use cases
Solution Approach 1:
The invention changes the structural parameters of control channel elements including resource element patterns, mapping relationships, and aggregation level configurations. By optimizing these parameters for narrow band scenarios, the system achieves improved detection performance within the constrained bandwidth without requiring additional spectrum resources.
Solution Approach 2:
The system dynamically selects appropriate control channel element structures based on the aggregation level and bandwidth conditions. Different CCE structures are activated depending on the specific scenario, allowing flexible adaptation to narrow band constraints while maintaining optimal detection performance.
Data Source
AI summary
A method comprising receiving an indication of modifying of at least one control channel element structure within an initial control resource set that is configured for an apparatus, determining at least one modified control channel element structure for at least one aggregation level in the initial control resource set, monitoring physical downlink control channel from the initial control resource set according to the modified control channel element structure, and receiving a physical downlink shared channel according to the physical downlink control channel received via the modified control channel element structure.